יָכוֹל מֵראשׁ חֹדֶשׁ? תַּלְמוּד לוֹמַר בַּיּוֹם הַהוּא. אִי בַיּוֹם הַהוּא יָכוֹל מִבְּעוֹד יוֹם? תַּלְמוּד לוֹמַר בַּעֲבוּר זֶה – בַּעֲבוּר זֶה לֹא אָמַרְתִּי, אֶלָּא בְּשָׁעָה שֶׁיֵּשׁ מַצָּה וּמָרוֹר מֻנָּחִים לְפָנֶיךָ. וְהִגַּדְתָּ לְבִנְךָ “AND YOU SHALL TELL YOUR CHILD” –
One might have thought
this meant from the beginning of the month.
And so it says, “on that day.”
Had it said only “on that day,”
one might have thought [the obligation] applied during the day.
And so it also says, “Because of this” –
“because of this” can only be said
when matza and bitter herbs are there before you.